# if 5>2:
#     print("5 is greater than 2")
#
#     print("2222")
# else:
#     print("5 is not greater than 2")
#     age =30
#     if age < 18:
#         print("you are underaged")
#     elif age >=18 and age<30:
#         print("you are young")
#     elif age >=30 and age < 50 :
#         print("you are middle-aged")
#     else:
#         print("you are old")
# #判断闰年
#         year = int(input("请输入年份："))
#         if (year % 4 == 0 and year % 100!=0) or (year %400 ==0):
#             print("%d是闰年" %year )
#         else:
#             print("%d不是闰年" %year)




#abc比较大小
a=int(input("请输入a"))
b=int(input("请输入b"))
c=int(input("请输入c"))
if a>b:
    if a>c:
        print("a is the largest")
    else:
        print("c is largest")
else:
    if b>c:
            print("b is the largest")
    else:
            print("c is the largest")

#计算器实现加减乘除


num1 = float(input("请输入第一个数字："))
num2 = float(input("请输入第二个数字"))
op = input("请输入运算符：")
if op =="+":
    print(num1+num2)
elif op =="-":
    print(num1-num2)
elif op =="*":
    print(num1*num2)
elif op=="/":
    print(num1/num2)
else:
    print("输入错误")
